<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<script>
    //1.将数组map，filter，reduce，every改写成箭头函数形式

        const arr = [1, 2, 3, 4, 5, 6]

        // const arr1 = arr.map(
        //     function (element) {
        //         return element + 1
        //     }
        // )
          const arr1 = arr.map(
           element=>element + 1
        )
        console.log(arr1);
 // const new_arr = arr.filter(
        //     function (e){
        //         return e%2==0  //true：返回 false：不符合条件=>过滤
        //     }
        // )
     const new_arr = arr.filter(
            e=> e%2==0
    )
    console.log(new_arr);
 // var sum = arr.reduceRight(
        //     function (v1,v2){
        //         return v1*v2
        //     }
        // )
         var sum = arr.reduceRight(
           (v1,v2)=>v1*v2
        )
        console.log(sum);
// var isMatch = arr.every(
        //     function (e){
        //         return e>1
        //     }
        // )
        var isMatch = arr.every(
            e=> e>1
        )
        console.log(isMatch);
</script>
<body>
    
</body>
</html>